Motorola pro7100 Manuel de service Page 62

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Vue de la page 61
3-8 Maintenance
IF Signal at
C3101?
No
RF Signal at
T4051?
RF Signal at
C4015?
No
RF Signal at
C4009?
No
RF Signal at
C4025?
No or
Check harmonic filters L4491-L4493, C4492
and ant.switch D4471,D4472,L4472.
Check filter between
C4025 & C4009. Check
tuning voltage at R4060.
Inject RF into J4401
Is tuning volt-
age OK?
No
Ye s
Check RF amp (Q4003)
Stage.
Check filter between
C4015 & T4051.
Ye s
Check T4051, T4052,
D4051, R4052, L4008.
Ye s
1st LO level
OK?
Locked?
Ye s
Check FGU
Ye s
Trace IF signal
from C3101 to
Q3101. Check for
bad XTAL filter.
No
Ye s
IF signal at
Q3102 collec-
tor?
Before replacing
U3101, check
U3101 voltages.
Ye s
Check for
5VDC
Is 9V3
present?
Check Supply Voltage cir-
cuitry. Check U0611 and
U0641.
No
No
No
Check U4501.
Check varactor filter.
No
Ye s
Ye s
Ye s
A
A
B
weak RF
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
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